Gib system：Is it 4th suit?

[lycier]

[hv=http://www.bridgebase.com/tools/handviewer.html?sn=机器人&s=SAQJ6HQDJT653CQT2&wn=lycier&w=S84HAJ3DAQ974C643&nn=机器人&n=SKT53HKT94DK8CAJ8&en=机器人&e=S972H87652D2CK975&d=n&v=n&b=&a=1C(Minor%20suit%20opening%20--%203+%20%21C%3B%2011-21%20HCP%3B%2012-22%20total%20points)P1D(One%20over%20one%20--%204+%20%21D%3B%206+%20total%20points)P1H(3+%20%21C%3B%204+%20%21H%3B%2011+%20HCP%3B%2012-18%20total%20points)P2S!(Fourth%20suit%20forcing%20--%205+%20%21D%3B%204%20%21S%3B%2012+%20HCP%3B%2013+%20total%20points%3B%20forcing%20to%203N)P3S(3+%20%21C%3B%204%20%21H%3B%204%20%21S%3B%2011+%20HCP%3B%2012-18%20total%20points%3B%20forcing)P4S(5+%20%21D%3B%204%20%21S%3B%2012+%20HCP%3B%2013-18%20total%20points)PPP&p=S4S5S9SJHQHAH4H2S8S3S7SQD3DAD8D2H3HTH5C2HKH7CTHJCAC7CQC3C8C9S6C4D6D4DKS2H8D5D7H9CJCKSAC6DJDQSKC5STH6DTD9]400|300[/hv]

 

The explanations of 2♠ are "Fourth suit forcing--5+♦,4♠,12hcp+,13Tps,forcing to 3N".

I think this explanations are incorrect.

 

1♣--1♦

1♥--1♠

?

I think 1♠ is 4th suit without 4 card ♠,but 2♠ is a reverse bid with 4-card ♠,it is just in line with responder's original intention.

any ideas?

 

 

[gordontd]

The explanations of 2♠ are "Fourth suit forcing--5+♦,4♠,12hcp+,13Tps,forcing to 3N".

I think this explanations are incorrect.

 

1♣--1♦

1♥--1♠

?[/size]

I think 1♠ is 4th suit without 4 card ♠,but 2♠ is a reverse bid with 4-card ♠,it is just in line with responder's original intention.

any ideas?

I wouldn't describe as "fourth-suit forcing" a bid that shows four cards in the suit. "Natural and forcing" is a better description.

 

As regards terminology, 2♠ is not a reverse because it is a jump bid.

 

It's common in my experience to play 1♠ in this auction as natural, forcing for one round only, and 2♠ as FSF. However, when playing Walsh-style responses there's some merit to exchanging those meanings since the only hands that can have four spades are strong.

[georgi]

Explanation is corrected to natural and forcing in next version.